MP2 won't use batteries to provide power

DIY
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1

Dear all,

I have a 3-phase MP2 setup with 20kWh LiFePo4 batteries, a Cerbo GX, an EM24, and an SMA PV inverter (plus battery inverter) installed. I am trying to get the Victron components up and running.

I have set this up as a 3-phase MP2 system with ESS assistants up and running. The system does recognize the batteries and charges them if surplus PV power is available - this is working correctly (so also grid and SMA powers are properly recognized). However, the system does not use the batteries to provide power if PV is not sufficient, instead, the batteries remain at a pretty full level.

The mode of the ESS is in “Optimized (with BatteryLife)”. Min SOC at 20%, grid feed-in at -30. The MP2 switch is on “ON”. It currently is in passthru mode (so not using the battery).

When switching the MP2 switch to “Inverter only”, then it does use the batteries properly. So the issue is most likely something with the settings.

Would appreciate if you could help me figure out the issues.

(also have another challenge, but will post that in a separate thread as completely separate from this one)

Thank you!

2

Switch to “without Battrielife” for testing purposes
“With battery life” is not actually necessary for your batteries.

3

Thanks - done but no effect. QQ: do I simply need to wait a tiny bit for the new settings in the remote console to take effect of do I need to restart something (if so, how)?

4

the effect should occur immediately …

What is the battery monitor in the system?
The connection may have been interrupted … then the system is set to “pass through

5

I use the MP2 as battery monitor. No other connection to the battery-built-in BMS given

6

This is definitely a bad solution because no information can be transmitted from the BMS.
Can the BMS not be connected or is it not registered as a “battery monitor”?

7

Okay, I guess then the next step would be to connect the 4 batteries via VE.can to the Cerbo and then see if this changes anything?

8

If the possibility exists … in any case.
Do you have 4 individual BMS?

9

I have Taico batteries and would use the built-in BMS. If I understand it correctly, I can simply connect the batteries via each other with VE.can and they would communicate.
Will try this out most likely next weekend (will be gone for the next days) and will then report back here. THANK YOU!

10

If you use 4 individual BMS, only one of the BMS is used as a battery monitor.
The protective shutdown is of course carried out by the individual BMS, but all data can only come from one BMS!!!
Have a look at the “additional software” for the GX: Github / battery aggregator
Here you can combine several BMS in the system into one

11

Thank you!

12

@Juergen: please check your 12V/24/48V Fuse between Batery and Victron Inverter. Some Fuse reducing the power to protect them self instead to break the power.